Okay, so I have an additive question: Why were some of the Real Organization members replicas? Unless I'm mistaken, weren't Larxene and Marluxia in KH3 replicas? If so, then why? And how? They maintain their CoM memories -- a set of events that transpired over the course of a like a week, and resulted in their Nobody deaths. So, after CoM, wouldn't Larxene, Marluxia, Vexen, Zexion, and Lexeaus recomplete with their Somebodies? And do so a year before Axel, et al. awoke in the lab in Ansem the Wise's castle in Radiant Garden?
Braig/Luxu and Even were already recompleted and missing when Lea woke up in DDD, but weren't Dilan, Ienzo and Aeleus still recovering from the process of recompletion, despite the latter two having had their Nobodies killed by Riku a year before Axel sacrificed himself to get Sora to TWTNW?
So after their respective Nobody deaths in CoM, shouldn't Lauriam and Elrena have recompleted in Daybreak Town, or wherever their selves split? And then be split again by Xehanort at some point concurrent with DDD and re-join Organization XIII as Larxene and Marluxia again? If they were time-traveling hearts stored in replica bodies, then at what point could that possibly make sense from, and where/when are the real recompleted iterations of Elrena and Lauriam?
In fact, it doesn't make any sense whatsoever for any of the Org members in KH3 to be time travelers...
I do not understand time travel in this series. Maybe they should try implementing clearly defined and consistent rules.